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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e95f0470068b002c143ed084d7c784d24d5e979f81cbe66b9ec88e986a5bce' 
  AND token = 'lfzHPBllX8pKzshQ6kdR8YMSiMkuJsBZLiQ8EJg3bkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}